Got a 1980 Jimmy every so often the clutch refuses to work. By that i mean
that the shift fork seems to wrk its way out of the bell housing. So for a
while I can use the clutch normally then one day i will walk out and
nothing. Its a 350 motor (big suprise) with a Muncie 465 Trans. I have
reached my wits end. its been apart and back together in my garage three
times. What am i missing? The pedal travel seems strange but its been like
that ever since i got the truck. By that i mean it is stiff and slow
sometimes and the clutch seems to not have a firm lock up on the full rise
of the pedal. I'm wondering if I am missing somthing that was not there to
start with or perhaps i am doing wrong. I have tried to lube the pivot
point under the dash and have adjusted the hell out of this with no real
improvement. Does anybody have an idea or even a series of pictures of a
correct set up? from the under car view thanks all mark W.
email@example.com i will be out of the area but will look this
NG up when i get back if you have any questions
thank you all again
I'm assuming that you have a mechanical clutch. Is the trans a Muncie
or a New Process? First, all shafts have a retaining device such as a
bolt, screw, or detent (spring, ball bearing, and screw to keep it in
place.) Is the fork shaft from the trans going into the clutch? This
seems strange. Are we talking about the shift fork or the clutch fork?
If a bolt or screw is coming out or loose you may want to use blue lock
tight on the threads. Also try torquing any suspected bolts down. A good
book for torquing specs is the Proto tool catalog. They have a complete
reference towards the back.
If your clutch is not grabbing all the way your linkage is probably to
tight. You should have about 1" of play at the pedal before you feel
pressure. If it is a hydraulic system you need to bleed it.
Back tracking lets assume that your clutch fork (presses your throw out
bearing.) comes loose or out of place. The fork is attached by a pivot
and retaining spring (spring clip or other holding device). The retainer
might even be a flat spring clip with a cutout to embrace the pivot.
This is behind the fork. The Clutch fork should be securely attached to
the pivot. The retainer clamps around the pivot. If the spring is not
there or broken off than that is your problem. A loose clutch fork can
do some strange things. When you remove the trans try grease lubing the
input shaft at the bellhousing, but not to much. only a light coat as
you don't want it to get in your clutch disc. I'd be willing to bet that
it is the retaining spring on your clutch fork. You might have to put in
a new clutch fork (if the spring retainer is missing). Sometimes they
are rivrted on the fork back. Another sympton is lack of leverage at the
clutch (hard to press down). Try going to a dealer and asking them and
look at what a new one entails. Good luck to you.
thank you for your help, it is the clutch fork 9goes ito bell housing and
encompasses the shaft pulls clutch in and out. It seems to be working its
way out i will look for the spring that holds it in when i next take it
apart. any suggestions about the stiff pedal. pedal is so stiff that even
with no clutch in the truck the underdash spring will not pull it back.?
i will be out of the area but will look
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